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NASA Stardust Spacecraft Officially Ends Operations

Press Release From: Jet Propulsion Laboratory
Posted: Saturday, March 26, 2011

image PASADENA, Calif. -- NASA's Stardust spacecraft sent its last transmission to Earth at 4:33 .m.
PDT (7:33 p.m. EDT) Thursday, March 24, shortly after depleting fuel and ceasing operations.
During a 12-year period, the venerable spacecraft collected and returned comet material to Earth and
was reused after the end of its prime mission in 2006 to observe and study another comet during
February 2011.

The Stardust team performed the burn to depletion because the comet hunter was literally running on
fumes. The depletion maneuver command was sent from the Stardust-NExT mission control area at
Lockheed Martin Space Systems in Denver. The operation was designed to fire Stardust's rockets
until no fuel remained in the tank or fuel lines. The spacecraft sent acknowledgment of its last
command from approximately 312 million kilometers (194 million miles) away in space.

"This is the end of the spacecraft's operations, but really just the beginnings of what this spacecraft's
accomplishments will give to planetary science," said Lindley Johnson, Stardust-NExT and
Discovery program executive at NASA Headquarters in Washington. "The treasure-trove of science
data and engineering information collected and returned by Stardust is invaluable for planning future
deep space planetary missions."

After completion of the burn, mission personnel began comparing the computed amount of fuel
consumed during the engine firing with the anticipated amount based on consumption models. The
models are required to track fuel levels, because there are no fully reliable fuel gauges for spacecraft
in the weightless environment of space. Mission planners use approximate fuel usage by reviewing
the history of the vehicle's flight, how many times and how long its rocket motors fired.

"Stardust's motors burned for 146 seconds," said Allan Cheuvront, Lockheed Martin Space Systems
Company program manager for Stardust-NExT in Denver. "We'll crunch the numbers and see how
close the reality matches up with our projections. That will be a great data set to have in our back
pocket when we plan for future missions."

Launched Feb. 7, 1999, Stardust flew past the asteroid named Annefrank and traveled halfway to
Jupiter to collect the particle samples from the comet Wild 2. The spacecraft returned to Earth's
vicinity to drop off a sample return capsule eagerly awaited by comet scientists.

NASA re-tasked the spacecraft as Stardust-NExT to perform a bonus mission and fly past comet
Tempel 1, which was struck by the Deep Impact mission in 2005. The mission collected images and
other scientific data to compare with images of that comet collected by the Deep Impact mission in
2005. Stardust traveled approximately 21 million kilometers (13 million miles) around the sun in the
weeks after the successful Tempel 1 flyby. The Stardust-NExT mission met all mission goals, and
the spacecraft was extremely successful during both missions. From launch until final rocket engine
burn, Stardust travelled approximately 5.69 billion kilometers (3.54 billion miles).

After the mileage logged in space, the Stardust team knew the end was near for the spacecraft. With
its fuel tank empty and final radio transmission concluded, history's most traveled comet hunter will
move from NASA's active mission roster to retired.

"This kind of feels like the end of one of those old western movies where you watch the hero ride his
horse towards the distant setting sun -- and then the credits begin to roll," said Stardust-NExT
project manager Tim Larson from NASA's Jet Propulsion Laboratory in Pasadena, Calif. "Only
there's no setting sun in space."

Stardust and Stardust-NExT missions were managed by JPL for NASA's Science Mission
Directorate in Washington. The missions were part of the Discovery Program managed at NASA's
Marshall Space Flight Center in Huntsville, Ala. Joe Veverka of Cornell University was the
Stardust-NExT principal investigator. Don Brownlee of the University of Washington in Seattle was
the Stardust principal investigator. Lockheed Martin Space Systems built the spacecraft and
managed day-to-day mission operations.

For more information about Stardust and Stardust-NExT, visit: http://stardustnext.jpl.nasa.gov

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